Graphical user interface for a portion of a display screen



The FIGURE is a front view of the graphical user interface for a portion of a display screen showing our new design, according to the present invention.

The broken lines showing the unclaimed text are included for the purpose of illustrating environment and form no part of the claimed design. The portion of a display screen shown in broken line is included for the purpose of illustrating environment and forms no part of the claimed design. 

The ornamental design for a graphical user interface for a portion of a display screen, as shown and described. 